Your parents (grand parents?) totally had these, I promise. This is historically
accurate for Julie and Ivy.

In addition to everything you need for pants, you need:

Cloth -- Some sort of print cotton.

While we're at it, since we're making jeans, use denim to make the
pants! Don't cheat and use blue cotton, that's just stinky.

In addition to the two denim pant pieces you'll be cutting, cut two isosceles
triangles made from cotton. They should be about as tall as the measurement
from your doll's foot to somewhere around her knee.

Hem the short side of the triangles and the bottom of the pant legs. Fold
the triangle in half and use it to measure a line down the center of each
pant leg.

Cut the line ever so slightly shorter than the length of the triangle.

Pin each long side of the triangle to the side of the cut you just made.